On‐line monitoring of ultrasonic surgery with MR imaging

Ammar Darkazanli, Kullervo Hynynen, Evan C. Unger, John F. Schenck

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Ultrasonic surgery was performed in rabbits and dogs under the guidance of magnetic resonance (MR) imaging. Two different MR techniques were used to guide the ultrasound beam. T2‐weighted images showed lesion formation within a few minutes after sonication. T1‐weighted GRASS (gradient‐recalled acquisition in the steady state) images were sensitive to temperature elevations, permitting monitoring of lesion creation with MR imaging. Short TR T1‐weighted GRASS images were not as helpful in detecting temperature elevation because of a reduction in signal‐to‐noise ratio. T2‐weighted fast spin‐echo images were compared with conventional T2‐weighted spin‐echo images. The former produced high‐quality images in a fraction of the imaging time. This study shows that it is possible to monitor and guide ultrasonic surgery with MR imaging.

Original languageEnglish (US)
Pages (from-to)509-514
Number of pages6
JournalJournal of Magnetic Resonance Imaging
Issue number3
StatePublished - 1993


  • Hyperthermia
  • Magnetic resonance (MR) guidance
  • Muscles, Injury, 449.449
  • Muscles, MR, 449.12149
  • Rapid imaging
  • Temperature monitoring
  • Ultrasound (US), therapeutic

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


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